Automation System
A disadvantage of Numerical Control (NC) is:

the tape and tape reader are not reliable
one operator is needed for each machine.
None of these
the computer is not reliable
the machine tool can easily overheat

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Automation System
Semiconductor devices:

are less reliable than electro¬mechanical components
have a very short infant mortality period
None of these
All of these
usually have a very short MTBF (mean time between failure)

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